Railroad Archives Online
- CollectionD0288 - Terence Wahl Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3002 - Diesel Locomotives
- 28 more...
- ItemTRWahl0105 - Great Northern Diesel Locomotive 635, Bellingham, Washington, undated
- ItemTRWahl0106 - Great Northern Diesel Locomotive 635, Bellingham, Washington, undated
- ItemTRWahl0107 - Great Northern Diesel Locomotive, Bellingham, Washington, undated
- ItemTRWahl0128 - Great Northern Diesel Locomotive 510, Bellingham, Washington, undated
- ItemTRWahl0138 - Great Northern Diesel Locomotive 271A, Bellingham, Washington, undated
- ItemTRWahl0146 - Great Northern Diesel Locomotive 506, Bellingham, Washington, undated
- ItemTRWahl0158 - Great Northern Diesel Locomotive 251A, Wenatchee, Washington, undated
- ItemTRWahl0160 - Great Northern Diesel Locomotive 500, Bellingham, Washington, undated
- ItemTRWahl0170 - Great Northern Diesel Locomotive 210, Bellingham, Washington, undated
- 177 more...